canirequire

canirequire › ESM-only › decamelize

Is decamelize ESM-only? Can you require() it?

Convert a camelized string into a lowercased one with a custom separator: unicornRainbow → unicorn_rainbow

Last verified Sep 9, 2026 against decamelize@6.0.1. JSON

ESM-only ESM-only since 6.0.0 — last CommonJS version is 5.0.1

decamelize dropped its CommonJS build in 6.0.0 (October 2021). The last version you can require() on every Node.js version, including 18 and older, is 5.0.1, published Sep 29, 2021.

On Node.js 20.19+, 22.12+ and every newer release, require("decamelize") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
6.0.1 (Aug 19, 2025)
Module format
ESM-only
Last CommonJS version
5.0.1
ESM-only since
6.0.0 (Oct 1, 2021)
TypeScript types
Bundled
Node engines
^12.20.0 || ^14.13.1 || >=16.0.0
Weekly downloads
62.6M
License
MIT

Does decamelize@6.0.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("decamelize") from a CommonJS file and import "decamelize" from an ES module.

Runtimerequire("decamelize")import "decamelize"
Node.js 18✗ failsERR_REQUIRE_ESM✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4✓ works✓ works

How to import decamelize

ES modules (import)

import decamelize from "decamelize";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const decamelize = require("decamelize");

// Any Node.js version:
const decamelize = await import("decamelize");

// Or pin the last CommonJS release:
// npm install decamelize@5.0.1

Module format by version

Derived from the type, main and exports fields of every stable release on npm (15 versions; the newest 15 shown).

VersionsFormatFirst published
6.0.0 – 6.0.1ESM-onlyOct 1, 2021
1.0.0 – 5.0.1CommonJSJan 24, 2015

Frequently asked

Is decamelize ESM-only?

decamelize@6.0.1 is ESM-only. decamelize dropped its CommonJS build in 6.0.0 (October 2021). The last version you can require() on every Node.js version, including 18 and older, is 5.0.1, published Sep 29, 2021.

Which version of decamelize still supports CommonJS / require()?

5.0.1 is the last version of decamelize with a CommonJS build. Install it with "npm install decamelize@5.0.1". Every version from 6.0.0 on is ESM-only.

How do I use decamelize from a CommonJS file?

Use a dynamic import: const mod = await import("decamelize"). On Node.js 20.19+, 22.12+ and newer, a plain require("decamelize") also works for ESM packages that do not use top-level await. Alternatively pin decamelize@5.0.1.

Does decamelize work in Bun?

Yes. import "decamelize" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does decamelize ship TypeScript types?

Yes. decamelize bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

Similar popularity